Re: MVCIN instruction

2005-10-18 Thread Phil Steele 
In my early days we had a pair of 2415's (2 drives each) and later 3 3410/3411 
pairs.

 as Pat O'keeke said earlier the 2415s did indeed snort rather loudly where 
loading (or unloading) tape into or from their funny wee horizontal vacuum 
column.

  I recall ( I was an operator then) that if you forgot that they were loaded 
and pushed the release button and tried to unload the tape manually, it would 
snort loudly at you as if to say 'GIVE ME MY TAPE BACK!' and then snatch the 
tape back into the vacuum column. All in all a very petulant tape drive.

 the 3410/11's (with horizontal roller shutter doors)  were far more placid and 
well behaved ( they were faster too!).  the models we had were 30KB/s 2415s and 
a stunning 80KB/s for the 3410/11's. I thought we were made , until we got the 
3420-008s which I still think are the most impressive and dramatic looking  
tape drive ever.

  now that's what I call a rewind !

Phil Steele


-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED]
Behalf Of Doug Fuerst
Sent: Wednesday, 19 October 2005 8:41 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: MVCIN instruction


No, they were the 3410 I think. The 2415's were a little less than
eye height, and the actual drive was about 2 or 2.5 feet down. And
about 6 feet wide.

Doug


At 02:43 PM 10/18/2005, you wrote:
On Oct 18, 2005, at 6:57 AM, Doug Fuerst wrote:

It was the 2415, 2 tape drives, no pneumatics, side by side, with
sliding doors.

Were those the ones that were about waist high and the glass slide
across and down a bit?
Ed

snip
Doug Fuerst
Consultant
BK Associates
Brooklyn, NY
(718) 921-2620 (Office)
(718) 921-0952 (Fax)
(917) 572-7364 (Cell)
[EMAIL PROTECTED]

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Re: Downgrade 9672

2005-06-22 Thread Phil Steele 
I remember the 'go-faster' stripes that Burroughs had to put on the B2700 after 
'upgrading ' it from a
B2500. I beleive this was needed to convince the Customer that he had actually 
got something for his (quite a lot of) money.
 this upgrade was really little more than a jumper chjange clock speed increase 
also.

I also remember that a 600 cards-per-minute 2501-001 card reader could be 
upgraded to a 2501-002 (1100 cards-per-minute) by the replacement of a 
different sized gear wheel. If you owned ( and maintained) the machine , no-one 
could stop you!

I always imagined that IBM's 'Licenced Internal Code' ( not to mentioned 
Graduated licnening charges, of course!)
 was a way to protect them from any one else being able to undo a  'Kneecapped' 
processor nowadays.
  

 -Original Message-
 From: IBM Mainframe Discussion List
 [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Black
 Sent: Wednesday 22 June 2005 12:33
 To: IBM-MAIN@BAMA.UA.EDU
 Subject: Re: Downgrade 9672

  I remnember Texas Tech getting a speed upgrade to there
 370/145 back
  in the 70's.  It consisted of the CE removing three loops from the
  145's microcode.  The price tag for this upgrade?  A cool $ 50K!

 I remember a story from long ago: Honeywell had a processed
 that came in single and double speeds, with a price jump.  If
 you had the slower processor and paid to upgrade to the
 faster, the CE removed a jumper that made the clock run at
 half-speed!  I can't swear this was true, could be one of
 those urban computer myths

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